Name: rm29839 Date: 05/21/98


import java.io.*;
import java.net.*;

public class SerialServer {
    static public void main(String args[]) throws Exception {
ServerSocket server = new ServerSocket(12345);
System.out.println("server listening on port "+server.getLocalPort());
Socket client = server.accept();
ObjectInputStream ois =
new ObjectInputStream(client.getInputStream());
for(;;) {
System.out.println(ois.readObject());
}
    }
}



import java.io.*;
import java.net.*;
import java.util.*;

public class SerialClient {
    
    static public void main(String args[]) throws Exception {
Socket server = new Socket("localhost", 12345);
System.out.println("connected to port " + server.getLocalPort());

ObjectOutputStream oos =
new ObjectOutputStream(server.getOutputStream());
oos.writeObject(System.getProperties());

oos.flush();
oos.close();

    }
}



run the server:

$ java -version
java version "1.2beta3"
$ java SerialServer
server listening on port 12345


run the client:

$ java -version
java version "1.1.5"
$ java SerialClient
connected to port 44953


the server will crash with:

java.io.InvalidClassException: java.util.Properties; Local class not compatible: stream classdesc serialVersionUID=4112578634029874840 local class serialVersionUID=-6012469190225919654
        at java.io.ObjectStreamClass.setClass(ObjectStreamClass.java:378)
        at java.io.ObjectInputStream.inputClassDescriptor(ObjectInputStream.java:776)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:358)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:233)
        at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:963)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:374)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:233)
        at SerialServer.main(SerialServer.java:12)


1.1.5 also fails to deserialize properties serialized with 1.2b3.


jm.
(Review ID: 28846)
======================================================================